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Research about Randomising , need assistance here.

I'm currently doing some research about random number ,
my plan is to create a table which lay ten mines everytime i refresh it,
i try a lot of different way to fix bugs ,
but it still not able to lay ten mines every times.
I realize i miss "end if" , "end while",
but when we put it in the code the function will stop working.

//Creates Table
document.write('<table>');
//for loop that creates the row, increments from 0 to 9 each time it reiterates
for (var row=0; row<9; row++) {
//creates the table row
document.write('<tr>');
//a nested for loop that reiterates 9 times creating the <td>'s and then exits to the parent for loop.
for (var col=0; col<9; col++) {
//references all the <td>'s with a specific id attribute.
document.write('<td id="r', row, 'c', col, '">');
//document.write('&nbsp;');
//closes the <td>
document.write('</td>');
}
//closes the <tr> or row in plain English
document.write('</tr>');
}
//closes the <table> tag
document.write('</table>');